For full samples by Seb Farges taken on the GH2 click here The Pentax 6mm F1.2 c-mount lens is the cheapest fast wide lens for DSLR filmmaking currently available. To use it you will need to have a Panasonic GH2, and to enable 1080p Ex-Tele mode (commonly known as 1:1 crop mode). It gives a feel similar to 8mm or 16mm film on the GH2.